Solre-sur-Sambre Castle was built around the turn of the 13th and 14th centuries and retains much of the medieval structure. Later in the 14th or 15th century this keep was incorporated in a square castle with circular towers at its four corners. The keep was transformed to a gate tower. It is the property of the Princes de Merode.
Visby Cathedral (also known as St. Mary’s Church) is the only survived medieval church in Visby. It was originally built for German merchants and inaugurated in 1225. Around the year 1350 the church was enlarged and converted into a basilica. The two-storey magazine was also added then above the nave as a warehouse for merchants.
Following the Reformation, the church was transformed into a parish church for the town of Visby. All other churches were abandoned. Shortly after the Reformation, in 1572, Gotland was made into its own Diocese, and the church designated its cathedral.
There is not much left of the original interior. The font is made of local red marble in the 13th century. The pulpit was made in Lübeck in 1684. There are 400 graves under the church floor.